Five miles east of Tehachapi Pass, between Bakersfield and Mojave, in Kern County, California, there occurs a deposit of Fuller’s earth which has been developed by the Filtrol Company of Los Angeles for use in oil refining. The clay is mined by means of small tunnels and hauled on trucks to a siding on the Southern Pacific railroad, where it is stored for shipment to Los Angeles. A large bin has been built at the siding to provide storage for carload lots. Open construction of the bin permits air drying of the clay which at the same time results in a considerable amount of checking and cracking.

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